This is really beyond the context of this discussion, but I think that the promise of "being digital" is here for a lot of our world, and that having separate, time consuming procedures for such a tiny fraction of our data like a dive log seems unnecessary to me.
All of my dive data (along with vast amounts of other data like family photos, genealogy information, videos, interviews with relatives who are now gone, financial data, personal contact information, writing, lectures that I give, medical records, legal contracts, etc...) lives on my laptop's hard drive.
When I am at work, the laptop is connected to an external Time Machine drive that automatically backs up everything in the background without my thinking about it (1 TB drive is about $50 now). In addition, I back up to a second external drive at home every once in a while. Furthermore, I subscribe to CrashPlan ($50/year) which is also making a rolling backup whenever my laptop is on a WiFi signal (almost always). My dive data is also on my phone and on iCloud (synced with MacDive), so that it's always with me, and backed up yet one more time without effort.
The point of this is that the important stuff isn't the laptop, or the external drives, it's the data. So yeah, a computer can fail, a network can crash, but if you are good with your data like this that should be of no more than passing concern. I hardly ever think about this process - apart from the second external drive it's all happening in the background.
And yeah, if I was worried about an EMP attack, I could just print out the dive log and have a nice little booklet to peruse for when SkyNet becomes self-aware...!
Love it, my laptop backs itself up offsite too, I know my handwritten logs take a small amount of time, but I enjoy the act of writing - it's unfortunately a dying art. The only reason I type up my blurbs is in case of fire, that may destroy my logbooks.
Glad to know I'm not the only one fearing both the Armageddon and Skynet lol